Merge pull request #25 from nobu/rdoc-coverage #99

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.6 / ubuntu-latest)	20s
build (2.6 / macos-latest)	54s
build (2.6 / windows-latest)	3m 24s
build (2.7 / ubuntu-latest)	17s
build (2.7 / macos-latest)	55s
build (2.7 / windows-latest)	1m 49s
build (3.0 / ubuntu-latest)	7s
build (3.0 / macos-latest)	8s
build (3.0 / windows-latest)	1m 13s
build (3.1 / ubuntu-latest)	6s
build (3.1 / macos-latest)	10s
build (3.1 / windows-latest)	1m 19s
build (3.2 / ubuntu-latest)	8s
build (3.2 / macos-latest)	14s
build (3.2 / windows-latest)	1m 9s
build (3.3 / ubuntu-latest)	7s
build (3.3 / macos-latest)	16s
build (3.3 / windows-latest)	2m 0s
build (head / ubuntu-latest)	5s
build (head / macos-latest)	11s
build (head / windows-latest)	1m 30s
	16m 24s

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